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Google start’s supporting canonical supporting HTTP header’s.Google made the change’s according to the webmaster’s feedback.The HTTP header’s syntax is described in details here:section 5 of IETF RFC 5988.
On a WebmasterCentral Blogpost Pierre Far, Webmaster Trends Analyst, notified this enhanced addition.He wrote”
To see the rel=”canonical” HTTP header in action, let’s look at the scenario of a website offering a white paper both as an HTML page and as a downloadable PDF alternative, under these two URLs:
In this case, the webmaster can signal to Google that the canonical URL for the PDF download is the HTML document by using a rel=”canonical” HTTP header when the PDF file is requested; for example:
Another common situation in which rel=”canonical” HTTP headers may help is when a website serves the same file from multiple URLs (for example when using a content distribution network) and the webmaster wishes to signal to Google the preferred URL.”
To know more about cannonical link element,watch this video:
Published by Anirban Das,Zebra Techies,India